Grep for content in XML tags

Be it for web services, or for finding things in Jenkins XML files. Being able to grep the tag attribute
or tag name might be useful. Look at the following example that uses the
books XML provided by Microsoft for testing.

grep-oP"(?<=<genre>).*?(?=</genre>)" books.xml | sort | uniq

Which will outputs the following.

Computer
Fantasy
Horror
Romance
Science Fiction

Find Python site packages directory

Sometimes you have Anaconda, but also the system installation, and maybe even other Python distributions.
Knowing where Python is looking for site packages can be helpful to confirm the package exists, and also
to inspect its sources.

Force no-cache via curl for a list of files

Useful when you have a proxy like squid caching some requests from an application and you
want to flush the cache and get the latest content (which will be cached again, but then
you can fix it once confirmed).